Dean Winchester went through some big changes in the Season 13 finale...

TV Insider spoke with Padalecki at The CW Upfront this week, where he reflected on his on-screen brother's new identity. After playing a few different characters himself through the years — Soulless Sam, anyone? — you can bet he had some advice for Ackles. The actor also spilled on Sam's state of mind going into Season 14, and what he'll be doing when we see him next.

All that and more in the full clip below, including what he thought of that ambitious Scoobynatural episode: